#include <ESP32Servo.h>

const int pirPin = 12;
const int trigPin = 13;
const int echoPin = 14;
const int servoPin = 15;
const int ledPin = 2; // Change to your preferred LED pin

Servo lidServo;

void setup() {
  Serial.begin(9600);
  pinMode(pirPin, INPUT);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(ledPin, OUTPUT);

  lidServo.attach(servoPin);
  lidServo.write(0); // Initial position: Closed lid
}

void loop() {
  int pirState = digitalRead(pirPin);
  if (pirState == HIGH) {
    openLid();
    delay(5000); // Keep the lid open for 5 seconds
  } else {
    closeLid();
  }

  float distance = getDistance();
  float binCapacity = map(distance, 0, 100, 100, 0); // Mapping distance to percentage

  Serial.print("Bin Space: ");
  Serial.print(binCapacity);
  Serial.println("%");

  if (binCapacity < 10) {
    digitalWrite(ledPin, HIGH); // Turn on LED if space is less than 10%
  } else {
    digitalWrite(ledPin, LOW);
  }

  delay(1000); // Delay between sensor readings
}

void openLid() {
  lidServo.write(90); // Open lid position
}

void closeLid() {
  lidServo.write(0); // Close lid position
}

float getDistance() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  float duration = pulseIn(echoPin, HIGH);
  float distance = duration * 0.034 / 2; // Speed of sound = 0.034 cm/μs

  return distance;
}